linux-kernel - Re: [PATCH v2 0/7] x86/kvm/hyper-v: Implement KVM_GET_SUPPORTED_HV

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Message-ID: <a96cce45-bcaa-8a85-743d-fbba03a3c650@redhat.com>
Date:   Mon, 17 Dec 2018 19:04:52 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, Roman Kagan <rkagan@...tuozzo.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>, x86@...nel.org,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        Eduardo Habkost <ehabkost@...hat.com>
Subject: Re: [PATCH v2 0/7] x86/kvm/hyper-v: Implement
 KVM_GET_SUPPORTED_HV_CPUID

On 17/12/18 11:30, Vitaly Kuznetsov wrote:
>> Queued, thanks.  I moved this above the direct EOI series so that
>> KVM_CAP_HYPERV_STIMER_DIRECT need not exist at any point of the history.
>>
> Thanks! Just to make sure (and to conclude our discussion with Roman):
> with your Qemu maintainer hat on, do you agree with the design decision
> that KVM_GET_SUPPORTED_HV_CPUID's output value changes when
> KVM_CAP_HYPERV_ENLIGHTENED_VMCS gets enabled? This differs from
> KVM_GET_SUPPORTED_CPUID (where we always list all feature bits even if
> they require explicit enablement)?

It doesn't really matter, since the old capability cannot be removed.
If you want to change it with a patch on top, that's also okay with me.

Paolo